[SIPForum-discussion] STUN server

[Raghul Prasanna]

Hi All,
 
 I know this is bit out of topic, but I have question related to STUN, RFC 3498 for STUN says that if Change-request attribute is present in Binding request with Change Port and Change IP flags set, the Binding response should have Changed-address attribute in response.
 
  Also the rfc says change-request attribute could be used to distinguish between Restricted Cone NAT and Port Restricted Cone NAT. Can someone explain how change-request attribute does this?
 
  I know the diff between Restricted Cone NAT and Port Restricted Cone NAT, but just cant think how change-request attribute will distinguish. 
 
Thanks,
Raghul


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